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Method for preparing high-porosity porous ceramic material

A technology of porous ceramics and porosity, which is applied in the direction of ceramic products, applications, and other household appliances, and can solve the problems of excessive shrinkage, cracking, and inability to effectively maintain porosity of the green body

Active Publication Date: 2020-10-23
BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. Due to the preparation of porous ceramic materials with high porosity, the body of the porous ceramic material will experience excessive shrinkage and cracking during sintering, and the porosity cannot be effectively maintained
[0007] Therefore, it is difficult to obtain a porous ceramic material with a porosity greater than 70% by using the water-based gel injection molding method, so there is an urgent need for a method to solve the difficulty in obtaining a porosity greater than 70% by using the water-based gel injection molding method. The problem of porous ceramic materials of high porosity

Method used

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  • Method for preparing high-porosity porous ceramic material
  • Method for preparing high-porosity porous ceramic material
  • Method for preparing high-porosity porous ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Comparison of samples with pore-forming agent and ceramic fiber added and samples without pore-forming agent and ceramic fiber added.

[0058] In order to verify the effect of the pore forming agent and ceramic fiber on the wet billet, the following four groups of samples were prepared in this embodiment. The preparation process is as follows:

[0059] 500g deionized water, 60g acrylamide, and 6g N,N'-methylenebisacrylamide were stirred and mixed to form a water-based solution; the water-based solution, 200g ZrO 2 The powder and 3g of ammonium polyacrylate were mixed and ball-milled at a speed of 100 rpm for 12 hours to obtain a slurry;

[0060] The obtained slurry was equally divided into four parts, numbered sample 1, sample 2, sample 3 and sample 4 respectively. Further add raw materials according to the formula in the table below, and ball mill for 12 hours at a speed of 100 rpm.

[0061]

[0062] Add 20.5g of 20%wt ammonium persulfate aqueous solut...

Embodiment 2

[0068] Embodiment 2: determination of ceramic fiber content

[0069] The slurry was prepared according to the formula of Example 1 above. Divide the resulting slurry into 5 parts, press ZrO 2 The mass ratio of the powder, respectively adding ceramic fiber, the ratio is 0%, 5%, 8%, 15%, 18%. The five samples were ball milled for 12 h at a speed of 50 rpm.

[0070] Add 20.5g of 20%wt ammonium persulfate aqueous solution and 2g of N,N,N',N'-tetramethylethylenediamine to the above five samples respectively, stir well and quickly pour them into the polypropylene mold coated with silicone oil , the size of the mold is 145mm×145mm×70mm, and the thickness of the injection mold is 20mm; the mold is placed in a water bath at 55°C for curing; the wet billet that has been cured and the temperature has dropped to room temperature is removed from the mold; the wet billet is vacuum freeze-dried Drying, the vacuum freeze-drying process is as follows: freeze at -60°C for 8h, then vacuumize ...

Embodiment 3

[0075] In this example, the organic monomer is acrylamide, the crosslinking agent is N,N'-methylenebisacrylamide, the dispersant is ammonium polyacrylate, and the catalyst is N',N'-tetramethylethylenediamine. The initiator is ammonium persulfate.

[0076] The preparation process proceeds as follows:

[0077] 307g deionized water, 44.4g acrylamide, 4.4g N,N'-methylenebisacrylamide were mixed together and fully stirred until a clear and transparent solution (i.e. water-based solution); the water-based solution, 145g ZrO 2 The powder and 3 g of ammonium polyacrylate were mixed and ball-milled for 12 hours to obtain a slurry;

[0078] 21.7g PMMA microspheres and 14.5g alumina fibers were added to the obtained slurry, and ball milled at a speed of 100 rpm for 12h to obtain a premixed liquid;

[0079] Add 20.5g of 20%wt ammonium persulfate aqueous solution and 2g of N,N,N',N'-tetramethylethylenediamine to the obtained premixed solution, stir well and pour it into a polypropylene m...

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Abstract

The invention relates to a high-porosity porous ceramic material. The material is characterized by being prepared by sintering, by weight, 44.4-76.5 parts of a water-based solution, 10-30 parts of ceramic powder, 0.1-1 part of a dispersing agent, 1-8 parts of a pore-forming agent, 1-6 parts of a ceramic fiber and 1-5 parts of an initiator. On the basis of a water-based gel casting method, the pore-forming agent and the ceramic fiber are added into the water-based solution, the ceramic fiber forms a supporting framework, shrinkage and cracking of raw materials during sintering are reduced, thepore-forming agent forms a mesoporous-macroporous composite structure, and then the high-porosity porous ceramic material with the mesoporous-macroporous composite structure is obtained.

Description

technical field [0001] The invention relates to a method for preparing a high-porosity porous ceramic material, through which the porous ceramic material with a porosity greater than 70% can be obtained, and belongs to the technical field of ceramic material preparation. Background technique [0002] Porous ceramic materials have the advantages of good mechanical properties, low thermal conductivity, high temperature resistance, corrosion resistance, etc., and are ideal materials for heat insulation. In some special use scenarios, such as the aerospace field, due to the harsh environment, porous ceramic materials with better heat insulation effect are required, that is, porous ceramic materials need to have higher porosity, and the porosity of porous ceramic materials is required to reach more than 70%. [0003] At present, among various methods for preparing porous ceramic materials, gel injection molding is the best method for preparing porous ceramic materials with a poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/634C04B35/622C04B35/48C04B35/10C04B38/06
CPCC04B35/48C04B35/622C04B35/6346C04B35/10C04B38/067C04B2235/5224C04B2235/6022C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B35/803C04B38/0605
Inventor 郑彧韦中华童亚琦张伟儒陈波李镔王子诚
Owner BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD
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